Machine for removing lining from a brake shoe



G CL 2, 1956 H. K. BIGELow 2,764,849

MACHINE FOR REMOVING LINING FROM A BRAKE SHOE I'NVEgvToR. Harry l1. B/ge/ow.

AWS WW H. K. BIGELOW 2,764,849 MACHINE FOR REMOVING LINING FROM A BRAKE.' SHOE Oct. 2, 1956 2 Sheets-Sheet 2 Original Filed Feb. ll, 1950 am mn INVENTOR. Har/y K. /qe/ow.

ATTO/@Alfy United States Patent O MACHINE FOR REMOVING LINlNG FROM A BRAKE SHOE Harry K. Bigelow, Cygnet, Ohio, assignor to West Realty Inc., Cygnet, Ohio, a corporation of Ohio 2 Claims. (Cl. 51-5) This invention relates to a machine for removing lining from a brake shoe or the like and is a division of my copending application, Serial No. 143,734, tiled-February 11, 1950, now Patent No. 2,674,309 dated April 6, 1954.

In general, the machine comprises a supporting member or mandrel having means for mounting a brake shoe on the periphery with the lining uppermost. A cutting member, in the form of an adjustable blade, is mounted on the machine so that the blade engages the lining. Movement of the brake shoe relative to the cutting member causes a cutting action which strips or peels the lining away from the brake shoe.

One of the objects of the invention is to construct` the machine with the mandrel having a slotted opening extending around the entire periphery. This opening in the mandrel provides for receiving the web of the brake shoe, so that the brake shoe flange rests on the surface of the mandred with the lining uppermost. This construction facilitates mounting the brake shoe in operating position with a minimum of time and effort.

In one embodiment of the invention the brake shoeis held in position on the mandrel with a removable pin. This pin extends through the sides of the mandrel in a position to engage the web at one end of the brake shoe. Thus, when the brake shoe is mounted with the web'in the slotted opening, the pin can be inserted in a position to abut against one end of the web and provides a driving member which carries the brake shoe around with the mandrel as the latter rotates.

Another object of the invention is to provide the machine with members, which can be in the form of rollers under spring tension, and which are positioned to hold the brake shoe while the cutting member engages the lining. Thus, when the brake shoe is brought into position for the cutting member or blade to engage the lining, the force of the cutting action can not lift or twist the brake shoe on the mandrel. One of the advantages of this construction resides in the fact that continued movement of the brake shoe past the cutting member and rollers carries the brake shoe around to a position where the brake shoe, with the lining removed, ca n drop freely from the mandrel.

A further object is to provide the machine with an adjustably mounted cutting blade, which can be adjusted to the angle best suited to cut or peel away the particular type and thickness of lining carried on the brake shoe, and with a minimum of power and time required. A cam on the periphery of the mandrel facilitates bringing the cutting blade into engagement with the lining. This cam also prevents the blade from striking the leading edge of the brake shoe ange as the mandrel rotates.

It is also an object to provide a machine of the type described which can be operated by either hand or mechanical power to remove the lining. Power can be applied either to drive the mandrel or, if preferred, the power can be connected to drive the hold-down rollers. With the latter construction, it is only necessary for the 2 operator to place the web of the brake'shoe in the slotted opening formed in the mandrel and move the brake shoe on the mandrel until the leading end engages under the first of the hold-down rollers. Where the mandrel is driven, the operator holds the brake shoe in position until it is carried around to the point Where the leading edge engages under the rst hold-down roller. The brake shoe, with the lining uppermost, is fed from the lirst roller past the cutting member and engages the second hold-down roller while the lining is being removed.

An additional object is to provide the machine with an abrasive element, preferably in the form of a wheel, which can be mounted in a position to engage the surface of the brake shoe after the lining has been cut away to provide for cleaning or roughening that surface in preparation for securing a new lining thereon. The abrasive element or wheel can be mounted between the hold-down rollers. In the preferred construction however, a third hold-down roller is provided to hold the brake shoe on' the roughened.v

A still further object is to provide a machine having the features described which can be compactly nand ruggedly constructed, which is adaptable for either hand or power driving, and which provides for fast, economical and safe operation without a high degree of skill being required.

Other objects and advantages of the invention will be apparent from the following description, the appended claims, and the accompanying drawings wherein preferred fonns of the invention are shown.

In the drawings:

Fig. 1 is a side elevational View of a machine constructed in accordance with one form of the invention;

Fig. 2 is an end elevational view of the machine shown in Fig. 1; f

Fig. 3 is a partial, vertical sectional view through the brake shoe and mandrel and showing the pin used to retain the brake shoe on the mandrel for amachine lconstructed as illustrated in Fig. l;

Fig.f4 is a partial, top elevational view showing the brake shoe mounted on the mandrel and held by the pin shown in Fig. 3; f

Fig. 5 is a partial, side elevational view of the blade and adjusting mechanism for controlling the blade angle relative to the lining;

Fig. 6 is a side elevational view of a modified? construction of the machine in which the hand lever for rotating the mandrel is replaced with a power drive and an abrasive wheel is provided to roughen the surface of the brake shoe after the lining is removed; j

Fig. 7 is a side elevational view of themachine with a modified mandrel construction, a power drive connected to drive the two hold-down rollers, and an abrasive wheel provided to roughen the surface of the brake shoe after the lining is removed; and

Fig. 8 is a View similar to Fig. 7 showing a power drive connected to drive the mandrel in place of the hold-down rollers. i y l Referring further to the drawings, in Fig. 1 the machine is shown with a frame 12 having side arms 13 and 14, Fig. l, and vertically 16,'Fig. 2.

The frame 12 supports the drum member or mandrel 19. This mandrelis carried on the axle 20'which is rotat-ably mounted between the side members 15 and 16 as seen in Fig. 2. The mandrelis formed with a slotted opening 21 which extends around the entire periphery of the mandrel, and provides a seat for receiving the web 22 of the brake shoe 18. 'Ihe opening 21 is of a depth to permit the flange 23 of the brake shoe to rest on the outer surface of the mandrel, with the lining 24 or stripped mandrel while the flange is being extending side members and uppermost, as shown in Figs. 3 and 4. To mount the brake 'shoe in operating position on the mandrel, the operator places the shoe with 'the web in the opening 21. Apin 27 is then Vinserted through circular openings .provided 'in the sides of the mandrel, as illustrated in Fig. 4, and forms latching means for holding the brake shoe in place on lthe mandrel. Pin '27 abuts against the trailing end`28 of the web and serves as a driving member. VThus when the mandrel is rotated the brake shoe is carried around with the mandrel.

A cutting member 30 is mounted in a position to engage the surface of 'the lining 24 for cutting or peeling the lining away from the flange 23 of the brake shoe. This cut ting member includes an 'arcuately formed blade 31, Fig. 5, which is pivotally connected to the cross rod 32 mounted between the side members 15 and 16, Fig. 2. The blade 31 is pulled down to the surface of the lining with a coil spring 33, Fig. l, having one end fastened to the blade and the other end fastened to one `of the-side members. The angle at which the blade 31 cuts is adjustably controlled by the micrometer mechanism indicated generally at 34 in Fig. 1. This mechanism includes `a pair of side arms 35 and 36, Fig. 2, pivotally connected to the cross rod 37 carried by the blade 31. A roller 38 is mounted between the arms 35 and 36 in a positionto ride upon the upper surface of the flange 23 when the blade engages the lining. The micrometer 34, Fig. 5, connects between the arms and the blade -to provide for accurately controlling the position of the blade relative to the arms 3S and 36 and thereby the angle at which the blade cuts n with respect to the ange surface of the brake shoe. In Fig. l the blade is shown adjusted to a position i. e. cutting angle to remove the entire lining with a single rotation of the mandrel. It will be readily apparent to those skilled in this art that the blade can be adjusted to a position to cut away less than the entire thickness of the lining if so desired.

A cam 39 on the surface of the mandrel provides for raising blade 31 and the roller 38. Cam 39 is `of sufcient height and positioned to prevent blade 31 from striking the leading edge of flange 23, as the mandrel rotates, in the event the blade has been adjusted too low. After the blade and roller pass over the cam the blade is free to drop down. This movement allows the blade todig into the lining i. e. cut down to the surface between f,

the lining and flange 23. To insure proper spacing of the cam from ythe leading edge of the brake shoe, a plurality of holes '40, Figs. l and 6, are spaced around the periphery of the mandrel which extend through the sides and into the slotted opening 21. A removable pin 44 can be placed through one of the holes to form an abutment against which the leading edge of the web 22 engages. This construction provides for properly spacing the brake shoe from the cam regardless ofthe type -of brake shoe, i. e., for example, one having ya long'leading web with the lining terminating short `of the leading edge as compared to a'brake shoe having a short or receding type of web with the lining terminating at the leading edge as indicated -generally in the drawings.

Means are provided for releasably holding the brake shoe on the mandrel while the cutting member engages the lining. In Fig. l, the means provided for this :purpose is a pressure applying member in the form of a roller'41-positioned in front of blade 31. The roller is carried at the endof arm 42 in -a-position -to ride upon the lining 24, as seen in Fig. l. The arm 42 is, in turn, pivotally connected to the outer end `of arm `14. A coil spring 43 provides forholding the roller aganst'the lming with sufficient force -to prevent the cutting action `of the blade against the lining from raising or 'twisting the brake shoe on the'mandrel.

As the'mandrel turns in the Fig. l, the leadingedge 25 of the brake shoe moves past the cuttingedgeof blade 31. The Vlining-24 Yiscut away from the surface of the ange .23, and the leading edge direction of the arrow-46,

4 is carried around to the roller 48 positioned to the rear of blade '31. This roller is similar-'in construction and mounting to roller 41. That is, roller 48 is carried at the end of arm 49 which, in turn, is pivotally mounted v on the outer end of arm 13. A coil spring 50 provides for holding roller 48 under tension. Roller 48, is, in the preferred construction, spaced around Athe periphery i. e. to the rear of the cutting member 30 to provide a second hold-down member for the brake shoe which Aengages the flange while roller 41 is still in contact with the lining.

A hand operating lever 52 -is connected to a crank arm 53 on the axle 20. A springipressed pin 54 provid for adjustably Apositioning the lever on the crank arm. In operation, when the operator pulls down on the lever, as viewed in Fig. l, the mandrel is rotated in the direction of the arrow 46. This movement of the mandrel carries the leading edge .2S of the brake shoe under the .roller 41. The lining 24 is then brought into engagement with the blade 31 which strips or peels the lining away from the flange of the brake shoe. Further rotation .of the mandrel carries the leading edge around until the roller 48 rides upon the surface of the ila-nge from which the lining has been removed. The engagement of the rollers l41 and-48 on the brake shoe, while the cutting action proceeds, prevents the brake shoe from lifting or twisting on the mandrel. Continued rotation of the mandrel carries the brake shoe around until the trailing edge 27 passes the roller 48. The brake shoe is then in a position to drop freely from the mandrel and another brake shoe can be positioned thereon to repeat the Aoperations.

In the modified construction shown in Fig. 6, the hand operating lever 52 has Abeen removed and the mandrel is rotated by a belt power drive, not shown, connected in the usual manner 'to a pulley 56 carried on the axle 20. There Ais lalso provided an abrasive element in the form of a wheel57. This -wheel is mounted on -the frame with a bracket, not shown, and can be driven from the same power source as the mandrel. Wheel 57 is adjustably mounted between the rollers 41 and 48 and can be positioned toengage the surface of the flange, after theV lining has been removed, to provide for roughening or cleaning :that surface to facilitate securing a new lining thereon.

In Fig. 7 the mandrel 61 is constructed with a slotted opening extending around the entire periphery 'of the mandrel. This mandrel is rotatably mounted on a shaft carriedby the-supporting plate 64. As seen in Figs. 7 and 8, plate 64 isprovided with angle iron supports 65 to facilitate mounting 'the plate in a vertical position on a work bench or the like.

A pair of blocks 67 and 68 are mounted on plate 64, each block being held with a bolt and nut, as indicated at69, which extends lthrough the slotted opening 70. Each ofthe blocks 67 and 68 has a block 71 and 72, respectively, mounted thereon With a pivotal connection 73. The 'blocks 751 and 72 -each 'have a threaded bolt 74 extending through the upper end, Fig. 7. A compression spring engages between the head of bolt 74 and a stop member 76. This spring provides a force which tends tofswing the blocks 71 and 72 about their pivots 73. The stop members '77 limit the extent of movement of `the 7 blocks 71 and 72. A serrated roller 78 is mounted on block 71 in aposition to ride on the surface of the lining 24 as shown in Fig. 7. A serrated roller 79 is similarly. mounted on 'block 72, but its position is adjusted to provide for the roller riding on the ange where the lining has been removed. In operation, this position of roller 78 is adjusted by moving block 67 within the limits .permitted by slot 70. Roller 79 is positioned by moving block 68. Adjustments of the bolts 74 control the tensionfof springs 75 -and lthe amountof pressure exerted by the rollers 78 and 79.

The cutting member, indicated generally at 81 in Fig. 7, comprises a block 82 mounted on the plate 64 with a bolt and nut 83 extending through the slot 84. The blade 85 is carried on the flanged edge of block 82, as shown in Figs. 7 and 8. The block can be adjusted on the plate 64, to the extent permitted by the slot 84, to adjust the cutting position of the blade relative to the lining.

In the machine illustrated in Fig. 7, power is applied through the pulley 100, driven by the belt 101, to drive the roller 78. Roller 79 is driven by the pulley 103 from belt 107 in the usual manner. Also, if desired in this modification, the abrasive wheel 57 is mounted to provide for roughening the surface of the flange after the lining has been removed, as previously described. The mandrel 61, rollers 78 and 79, and wheel 57 are all rotated in the direction of the arrows as shown in Fig. 7. In this construction a third hold-down roller, indicated generally at 104, is provided to hold the brake shoe on the mandrel while the ange is being roughened by engagement with wheel 57. As shown in Fig. 7, the construction and mounting of member 104 is similar to that for the -rollers 78 and 79. Member 104 is spaced around the periphery away from roller 79, the same distance that roller 78 is spaced away from roller 79. This distance is such that the leading edge of the brake shoe is gripped by roller member 104 while the trailing edge is being gripped by roller 79.

In Fig. 8 power is applied to drive the mandrel 61. A pulley 105, driven by the belt 106, is provided to supply the driving power. The abrasive wheel 57 can also be used in this modification, as shown, if desired. Power is supplied to drive the wheel 57 in the usual manner.

In operating either of the machines shown in Fig. 7 or Fig. 8, it is only necessary for the operator to place the brake shoe on the mandrel. brake shoe on the mandrel until the leading edge is gripped under the roller 78. After the lining is removed and the trailing end of the brake shoe passes the roller member 104, the brake shoe drops from the mandrel.

From the above description it will be apparent that the machine is constructed and operates to accomplish the objects and advantages set forth. However, while the embodiments of the invention disclosed herein constitute preferred forms, -it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow:

I claim:

l. A machine for removing lining from a brake shoe comprising a supporting member having a rotatably mounted mandrel with an arcuate surface formed with a slot adapted to receive the brake shoe web; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially tangential to said surface to provide for cutting the lining away from the brake shoe; a pressure applying roller mounted on said supporting member forwardly of the cutter and ad- The operator holds the jacent said arcuate surface to engage the lining of the brake shoe in advance of the cutting member; a second pressure applying roller mounted on said supporting member rearwardly of the cutter and adjacent said arcuate surface to engage the upper surface of the brake shoe after the lining has been removed therefrom; means for resiliently urging said rollers toward said arcuate surface; an abrasive element carried adjacent said supporting member and mounted between said pressure applying rollers in a position to engage the surface of the brake shoe from which the lining has been removed to provide for roughening said surface; and means applying power to rotate the mandrel.

2. A machine for removing lining from a brake shoe comprising a supporting member having a rotatably mounted mandrel with an arcuate surface formed With a slot adapted to receive the brake shoe web; a cutting member mounted on said supporting member adjacent the mandrel having a cutting edge substantially tangential to said surface to provide for cutting the lining away from the brake shoe; a pressure applying roller mounted on said supporting member forwardly of the cutter and adjacent said arcuate surface to engage the lining of the brake shoe in advance of the cutting member; a second pressure applying roller mounted on said supporting member rearwardly of the cutter and adacent said arcuate surface to engage the upper surface of the brake shoe after the lining has been removed therefrom; a third pressure applying roller mounted on said supporting member rearwardly of said second pressure applying roller in a position to engage the upper surface of the brake shoe after the lining has been removed therefrom; an abrasive element carried adjacent said supporting member and mounted between said second and third pressure applying rollers in a position to engage the surface of the brake shoe from which the lining has been removed to provide for roughening said surface; means for resiliently urging said rollers toward said arcuate surface; and means applying power to rotate the mandrel.

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